[llvm] constant fold bfloat <-> half bitcasts (PR #177663)

[via llvm-commits]

github-actions[bot] wrote:

<!--PREMERGE ADVISOR COMMENT: Windows-->
# :window: Windows x64 Test Results

* 130145 tests passed
* 2881 tests skipped
* 1 test failed

## Failed Tests
(click on a test name to see its output)

### LLVM
<details>
<summary>LLVM.Transforms/InstCombine/cast.ll</summary>

```
Exit Code: 2

Command Output (stdout):
--
# RUN: at line 3
c:\_work\llvm-project\llvm-project\build\bin\opt.exe < C:\_work\llvm-project\llvm-project\llvm\test\Transforms\InstCombine\cast.ll -passes=instcombine -S -data-layout="E-p:64:64:64-p1:32:32:32-p2:64:64:64-p3:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128-n8:16:32:64" | c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe C:\_work\llvm-project\llvm-project\llvm\test\Transforms\InstCombine\cast.ll --check-prefixes=ALL,BE
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\opt.exe' -passes=instcombine -S -data-layout=E-p:64:64:64-p1:32:32:32-p2:64:64:64-p3:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128-n8:16:32:64
# note: command had no output on stdout or stderr
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe' 'C:\_work\llvm-project\llvm-project\llvm\test\Transforms\InstCombine\cast.ll' --check-prefixes=ALL,BE
# note: command had no output on stdout or stderr
# RUN: at line 4
c:\_work\llvm-project\llvm-project\build\bin\opt.exe < C:\_work\llvm-project\llvm-project\llvm\test\Transforms\InstCombine\cast.ll -passes=instcombine -S -data-layout="e-p:64:64:64-p1:32:32:32-p2:64:64:64-p3:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128-n8:16:32:64" | c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe C:\_work\llvm-project\llvm-project\llvm\test\Transforms\InstCombine\cast.ll --check-prefixes=ALL,LE
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\opt.exe' -passes=instcombine -S -data-layout=e-p:64:64:64-p1:32:32:32-p2:64:64:64-p3:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128-n8:16:32:64
# note: command had no output on stdout or stderr
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe' 'C:\_work\llvm-project\llvm-project\llvm\test\Transforms\InstCombine\cast.ll' --check-prefixes=ALL,LE
# note: command had no output on stdout or stderr
# RUN: at line 5
c:\_work\llvm-project\llvm-project\build\bin\opt.exe < C:\_work\llvm-project\llvm-project\llvm\test\Transforms\InstCombine\cast.ll -passes=instcombine -S -data-layout="E-p:64:64:64-p1:32:32:32-p2:64:64:64-p3:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128-n8:16:32:64" -use-constant-fp-for-fixed-length-splat -use-constant-int-for-fixed-length-splat | c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe C:\_work\llvm-project\llvm-project\llvm\test\Transforms\InstCombine\cast.ll --check-prefixes=ALL,BE
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\opt.exe' -passes=instcombine -S -data-layout=E-p:64:64:64-p1:32:32:32-p2:64:64:64-p3:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128-n8:16:32:64 -use-constant-fp-for-fixed-length-splat -use-constant-int-for-fixed-length-splat
# .---command stderr------------
# | Assertion failed: api.getBitWidth() == Sem->sizeInBits, file C:\_work\llvm-project\llvm-project\llvm\lib\Support\APFloat.cpp, line 3986
# | PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace and instructions to reproduce the bug.
# | Stack dump:
# | 0.	Program arguments: c:\\_work\\llvm-project\\llvm-project\\build\\bin\\opt.exe -passes=instcombine -S -data-layout=E-p:64:64:64-p1:32:32:32-p2:64:64:64-p3:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128-n8:16:32:64 -use-constant-fp-for-fixed-length-splat -use-constant-int-for-fixed-length-splat
# | Exception Code: 0xC000001D
# |  #0 0x00007ff6d9796956 (c:\_work\llvm-project\llvm-project\build\bin\opt.exe+0x906956)
# |  #1 0x00007ffddcf6bb04 (C:\Windows\System32\ucrtbase.dll+0x7bb04)
# |  #2 0x00007ffddcf6cad1 (C:\Windows\System32\ucrtbase.dll+0x7cad1)
# |  #3 0x00007ffddcf6e4a1 (C:\Windows\System32\ucrtbase.dll+0x7e4a1)
# |  #4 0x00007ffddcf6e6e1 (C:\Windows\System32\ucrtbase.dll+0x7e6e1)
# |  #5 0x00007ff6d97f06a6 (c:\_work\llvm-project\llvm-project\build\bin\opt.exe+0x9606a6)
# |  #6 0x00007ff6d97ef38d (c:\_work\llvm-project\llvm-project\build\bin\opt.exe+0x95f38d)
# |  #7 0x00007ff6d99fe34d (c:\_work\llvm-project\llvm-project\build\bin\opt.exe+0xb6e34d)
# |  #8 0x00007ff6d99bb374 (c:\_work\llvm-project\llvm-project\build\bin\opt.exe+0xb2b374)
# |  #9 0x00007ff6da033060 (c:\_work\llvm-project\llvm-project\build\bin\opt.exe+0x11a3060)
# | #10 0x00007ff6da036377 (c:\_work\llvm-project\llvm-project\build\bin\opt.exe+0x11a6377)
# | #11 0x00007ff6da032fb1 (c:\_work\llvm-project\llvm-project\build\bin\opt.exe+0x11a2fb1)
# | #12 0x00007ff6da036377 (c:\_work\llvm-project\llvm-project\build\bin\opt.exe+0x11a6377)
# | #13 0x00007ff6da04109e (c:\_work\llvm-project\llvm-project\build\bin\opt.exe+0x11b109e)
# | #14 0x00007ff6da033211 (c:\_work\llvm-project\llvm-project\build\bin\opt.exe+0x11a3211)
# | #15 0x00007ff6da0545dd (c:\_work\llvm-project\llvm-project\build\bin\opt.exe+0x11c45dd)
# | #16 0x00007ff6da0569c2 (c:\_work\llvm-project\llvm-project\build\bin\opt.exe+0x11c69c2)
# | #17 0x00007ff6da05669e (c:\_work\llvm-project\llvm-project\build\bin\opt.exe+0x11c669e)
# | #18 0x00007ff6da055422 (c:\_work\llvm-project\llvm-project\build\bin\opt.exe+0x11c5422)
# | #19 0x00007ff6da02e950 (c:\_work\llvm-project\llvm-project\build\bin\opt.exe+0x119e950)
# | #20 0x00007ff6da02a0d7 (c:\_work\llvm-project\llvm-project\build\bin\opt.exe+0x119a0d7)
# | #21 0x00007ff6da0264a3 (c:\_work\llvm-project\llvm-project\build\bin\opt.exe+0x11964a3)
# | #22 0x00007ff6da025deb (c:\_work\llvm-project\llvm-project\build\bin\opt.exe+0x1195deb)
# | #23 0x00007ff6d91dd39e (c:\_work\llvm-project\llvm-project\build\bin\opt.exe+0x34d39e)
# | #24 0x00007ff6d91dd4d1 (c:\_work\llvm-project\llvm-project\build\bin\opt.exe+0x34d4d1)
# | #25 0x00007ff6d91e6529 (c:\_work\llvm-project\llvm-project\build\bin\opt.exe+0x356529)
# | #26 0x00007ff6d91e6b74 (c:\_work\llvm-project\llvm-project\build\bin\opt.exe+0x356b74)
# | #27 0x00007ff6d8e959e4 (c:\_work\llvm-project\llvm-project\build\bin\opt.exe+0x59e4)
# | #28 0x00007ff6d8e91025 (c:\_work\llvm-project\llvm-project\build\bin\opt.exe+0x1025)
# | #29 0x00007ff6dd735f50 (c:\_work\llvm-project\llvm-project\build\bin\opt.exe+0x48a5f50)
# | #30 0x00007ffde2d34cb0 (C:\Windows\System32\KERNEL32.DLL+0x14cb0)
# | #31 0x00007ffdf01dedcb (C:\Windows\SYSTEM32\ntdll.dll+0x7edcb)
# `-----------------------------
# error: command failed with exit status: 0xc000001d
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe' 'C:\_work\llvm-project\llvm-project\llvm\test\Transforms\InstCombine\cast.ll' --check-prefixes=ALL,BE
# .---command stderr------------
# | FileCheck error: '<stdin>' is empty.
# | FileCheck command line:  c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe C:\_work\llvm-project\llvm-project\llvm\test\Transforms\InstCombine\cast.ll --check-prefixes=ALL,BE
# `-----------------------------
# error: command failed with exit status: 2

--

```
</details>

If these failures are unrelated to your changes (for example tests are broken or flaky at HEAD), please open an issue at https://github.com/llvm/llvm-project/issues and add the `infrastructure` label.

https://github.com/llvm/llvm-project/pull/177663